Frequencies for first 10,000 rows of exp_dt_num variable in drug2012q1 dataset :

 Expiration |
date of the |
      drug. |
 (YYYYMMDD) |      Freq.     Percent        Cum.
------------+-----------------------------------
  31jul2013 |          1        0.01        0.01
  31aug2013 |          1        0.01        0.02
          . |      9,998       99.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Dec 2015